Profile dresser for abrasive wheels



April 1940. E. A. JOHNSON 'Er AL v PROFILE DRESSER FOR ABRASIVE WHEELS '5 Sheets-Sheet 1 Filed June 30, 1938 Ft l - INVENTORS E. A. JOHNSON In AL PROFILE DRESSER FOR ABRASIVE WHEELS April 23,1940.

5 Sheets-Sheet 2 3119a June so, 1958 VENTORS April 1940- E. A. JOHNSON El AL 2.197.762

PROFILE DRESSER FOR ABRASIVE WHEELS r1194 June so, 1938 5 sheets-sheet s I INVENTIORS April 23, 1940.

E. A. JOHNSON Er m. 2.197.762

PROFILE DRESSER FOR ABRA SIVE WHEELS I FilOd June 30, 193B 5 Sheets-Sheet 4 INVENTORS April 940- v E. A. JOHNSON El AL 7.76

' PROFILE DRESSER FOR ABRASIVE WHEELS Filcd June 30, 1938 5 Sheets-Sheet 5 Fig 11 L .I /43 IT II: a L

fi ll 34 -4.-7 45 '42 4/ H r60 l 1 67 9g l .39

INVENTORS i Paloma Apr-23, 9 2,197,762

UNITED STATES PATENT OFFICE PROFILE DRESSER FOR ABRASIVE WHEELS Edward A. Johnson and Alexander A. Emelianol'f, New York, N. Y.

Application June 30, i938, Serial No. 216,736

10 Claims. (Cl. 125-11) The present invention relates to the art of point and cause the same to move in straight abrading, and more particularly. to novel appalines at any practical angle. ratus for dressing abrasive wheels, being particu- Our invention has as another object to provide larly applicable as an attachment for surface instrumentalities applicable to hold a diamond 5 grinding machines to generate any desired propoint and cause the same to move in arcs of any 6 file upon the working'surface of the abrasive practical radius. wheel thereof to the end that such profile may Our invention has as a further object to probe imparted to the work. The invention is parvide instrumentalities applicable to hold a diaticularly, but not exclusively, adapted for use mond chip and cause the same to trace out con- 10 with surface grinders of the typ commonly used cave or convex arcs of predeterminedradius. 10 in the precision mechanical trades for forming Our invention has as another object to provide very precise plane surfaces upon hardened steel instrumentalities for the stated purpose so propieces, such as tool-and die parts. Such surface portioned and arranged as to provide a maximum grinders ordinarily comprise a rotatable spindle of visibility while in use.

upon whichismounted an abrasive wheel adapted Our invention has as another object to proto be rotated at high velocity in contact with the Vide instrumehlialities for the Stated p p work which is secured to a'reciprocable platen by which wi l give rea s in pp op units of means of a magnetic chuck. all movements imparted to the diamond.

. Abrading machines or surface grind r ar Our invention has as still another object to go commonly utilized to impart very smooth plane Provide pp ratus whiohw ll be light and portsurfaces to the work; but it is desirable to extend able, simp p ve. and nve i nt to adthe range of utility of such machines to include just and the production of other than plane surfaces; that Furthe!" Objects, a e d van s f is, profiles, consisting of various combinations the invention will become apparent upon of radial and tangent lines, the inter-dimensional sideretien 0f the following s r p n together 95 relationship of which are very precise. with the p yi d w n s wh h Set ort Abrasive wh el ar ordinarily dressed or trued illustratively an embodiment of the invention. up by applying a diamond point to their working In the drawings: 7 urfaces while t ti t same t high speed; Fig. 1 illustrates in elevation fragmentary por- Accordingly, is desirable, in carrying out tions of three abrasive wheels having profiled production of complex profiles in a surface grindworkmg Surfaces of the t'ype'generated by appar to first prepare th working urfa e of the ratus constructed in accordance withour' invenabrasive wheel by dressing or shaping the same with a diamond point t correspond t t desired Fig. 2 is a front elevation of the illustrative ofil and then impart'this pr file to the work embodiment of our invention mounted in operby reciprocating the samewhilein contact with ativepesitien in a surface d r, on y fra the prepared working surface of the abrasive mehtaly Portions of Which are S ow wheel. Fig. 3 is a side elevation in section taken on the The apparatus according to the invention inline of o cludes instrumentalities applicable to hold a Fig 4 is a fragmentary e n taken on the diamond point and cause the same to describe a line of path by moving progressively in straight lines F g. 5 is afragme y front elevation Of-Figat a desired angle, or in arcs of desired radius, 6 is a front v on o the pp r either concave or convex, to generate upon the cording t the invention; working surface of an abrasive wheel a profile Fig. '7 is a fragmentary Sect o in elevat o comprising any desired combination of radial and taken on the line |-l of Fig. tangential components, the inter-dimensional re- Fi 8 is a b t m v i par s n ta on lationship of which are very precise. the line 8-8 of Fig. 6;

Our invention has as an object to provide in Fig. 9 is an illustration of an end portion of 50 strumentalities applicable to impart to the workscrew 56, together with a fragmentary portion ing surface of abrasive wheels profiles comprisof endplate 62; I ing an infinite variety of radii and straight lines. Fig. 10 is a fragme tary right end view of Fig. Our invention has as another object to provide 8 showing a portion broken away on the line 65 instrumentalities applicable to hold a diamond Ill-Ill of Fig. 8; and u 11 is a top or plan view of the apparatus according to the invention.

In the drawings, in which like characters represent like parts throughout the several views, 20 (Fig. 2) represents an abrasive wheel secured to rotatable spindle 2| of a surface grinder, the frame of which is not shown. 22 represents a conventional guard or housing ordinarily arranged to cover the upper segment of wheel 29, but adapted to leave the lower part thereof exposed to permit the working surface 23 to contact the work. 24 represents the platen or table of the surface grinder, to which is ordinarily secured a magnetic chuck generally designated 25 having an upper plane fiducial surface 26 and a .rear guide rail 21 provided with a front fiducial edge 28 adapted to serve as means for aligning the work accurately in the plane of travel of table 24.

29 represents the pedestal or frame member of the illustratedembodiment of our invention having accurately finished bottom fiducial surface 30 and rear fiducial surface 3| Frame 29 is of course constructed of magnetic material such as cast ironso as to be readily held by magnetic chuck 25.

' Appropriately mounted in the device may be a diamond point 32 (Fig. 2) adapted to cut abrasive wheel 29 by contacting the same. Ball cranks 33 and 34 are provided for manual operation to cause diamond 32 to describe a path coincidental with the profile desired to be imparted to working surface 23 of wheel 20. Crank 33 when manually rotated causes diamond 32' to describe an arc, either concave or convex as desired, and of predetermined radius. Crank 34, when manually rotated, causes diamond point 32 to. describe a rectilinear path at a predetermined angle to chuck surface 26 and tangent, if desired, to arcs described by the diamond 32 responsive to rotation of crank 33.

When properly mounted in the surface grinder, as illustrated in Fig. 2, the device is so positioned that the produced vertical axis of diamond point 32 cuts the rotational axis of spindle 2| of the surface grinder; that is, diamond point 32 is positioned precisely below the center of wheel 29. The device is purposely designed so that all movements imparted to diamond point 32 occur in a vertical plane parallel to and coincident with the rotational axis of spindle 2|.

Upper portions 29 and 29" of frame 29 may be cut away as shown to clear guard 22 of the surface grinder to obviate the necessity of removing the same when using the device, and further to provide adequate visibility of the profile being generated. It will be noted that the operator has full visibility when operating the device due to the configuration of the upper portion of frame 29. This is an important feature of the invention. Y

Referring now particularly to Figs. 3, 6 and 11, frame 29 may comprise a substantially L shaped member having a lower horizontal foot portion 35 and an integral vertical portion 36, reinforced by a rear rib 31 and afront rib 38,. and stabilized by a forwardly over hanging foot 39. Frame 29 maybe precisely finished to provide fiducial surfaces 4|] and 4| at right angles.

Produced in the face 4| of the frame 29 may be a fragmentary annular or a rcuat'e T slot 42, of constant radius about an o i gin or center 0-0, and having a reduced neck portion 43 adapted to slidably receive a mating fragmentary annular lug or tongue 44 integral with a saddle 45 adjustably secured against face 4| by clamping means to be more fully described hereinafter. Saddle 45 may comprise an elongated metallic block having an integral downwardly and outwardly overhanging gib portion46, (Fig. 3) coextensive with its longer dimension, and a separate adjustable upwardly overhanging complementary gib member 41. Gib portion 46 and gib member 41 .are complementary and provide a precise, adjustable dovetail channel slidably receiving a mating dovetail slide portion '48 integral with a carriage generally designated 49. 1

Rectilinear motion may be imparted to carriage 49 by manual rotation of ball crank 34 which will, when knurled thumb nut 50 is tightened, drive dial 5| together with shaft 52 which is provided with an integral beveledpinion 53 meshing with beveled gear 55 (Fig. 8) having internal threads receiving threaded stationary lead screw 56. Shaft 52 may have a reduced portion 52. providing a shoulder 52 against "which the adjacent face of dial 5| may be caused forcibly to abut when thumb nut 50 is tightened. When thumb nut 50 is loosened, dial 5| and/or ball crank 34 may be rotated independently of shaft 52 in. order to conveniently make initial or zero settings of dial 5|. Dial 5| may be prounits rectilinear travel of carriage 4,9.

Carriage .49, (Fig. 8) may have a'longitudinal bore coinciding axially with the axisof IeadscreW vided with graduations to indicate in appropriate 56 in which bushings 51 and 58 maybe disposed so that their complementary ends provide pre cise thrust bearings for beveled gear 55. Bushings'51 and 58 may be secured to carriage 49 by set screws 51'.and 58'. Lead screw 56 may have reduced end portions 59 and 60 tightly'received by axially aligned apertures in end plates 6|, 62,

the precise way surfaces, lead screw, and gearing,

saddle 45 may be provided with slidable overlapping leaf covers 61, 68, 69, and 19. Covers 61 and 69 may be secured to the opposite endsof carriage 49 by screws 1|, 12. All of the covers may be provided with sloping way surfaces along their side edges adapted to be closely but. slidably:

received by auxiliary mating way surfaces bro- I vided in gib portion 46 and gib member 41 as illustrated most clearly in Fig. 7. Upper covers .61 and 69, being attached to carriage 49 by screws 1|, 12, are constrained to inove therewith, while covers 68 and 10 are capable of moving outwardly substantially their whole length, but are frictionally restrained from so doing by spring actuated plungers 1|, 12 slidably received in appropriate holes in plates 6|, 62. Covers 68 and 10 may be provided with limit stops comprising inwardly overhanging lips or lugs 68' and 19 integral with their outer terminals adapted to abut the outer faces of end plates 6|, 62 at a predetermined point of travel. M0-,

tion in the outward direction will be imparted positively to covers 68, 10 due to abutment of their inner ends with the adjacent faces of carriage 49, but return motion is imparted by detent drivers consisting of fiat cantilever leaf :5

covers 61, 69 by rivets 15, 16.

In order to gain a thorough understanding of the manner in which covers 61, 68, 69 and 10 at all times seal saddle 45, assume, referring to Fig. 8, that carriage 49 is being moved toward the right from the medial position illustrated. Covers 61, 68 and'69 will move with the carriage, but cover 10 will remain stationary due to abutmentof stoplug 10' with outer face of end plate 6|. If new carriage 49 is returned to the medial position, covers 61 and 69- will return likewise,

since they are secured to the carriage, as will also cover 68 due to the driving effect of detent driver 13. Cover 10, however, will remain stationary, being restrained from movement toward the left by frictional restraint of spring-urged plunger 12'. A similiar operation would of course ensue if carriage 49 were moved toward the leftfrom the medial position illustrated, with the exception, however, that the operation of covers 68 and 10 just described would be reversed. Hence the covers at all times automatically seal the interior of saddle 45 preventing entrance of abrasive grit, irrespective of the movements of carriage 49.

As previously described, saddle 45 may have an integral fragmentary annular tongueportion 44, Fig. 3, slidably received by neck portion 43 of arcuate T slot 42. Referring now particularly to Fig. 6, face 4| of frame 29 is also provided with a fragmentary circle or sector 11 graduated in degrees of arc throughout a preferable range of 150 degrees, -the zero line beingv at the apex of the lower limb, and the graduations increasing from zero in both clockwise and counterclockwise directions to 90 degrees, providing right and left graduated quadrants. Above the 90 degree points, new upper quadrants are begun which, however, extend only thru a range of 30 degrees, as illustrated.

Saddle 45 may. be susceptible of adjustment upon face 4| of frame 29 but is constrained, when moved, to describe a precise arcuate path, about O-O .as a center, due to engagement of tongue portion 44 in annular T slot 42. An appropriate fiducial line is provided on saddle 45 for comparison with graduated circle 11. This fiducial line may be engraved at the lower center portion of saddle 45 where material is removed as shown in Fig. 3 to' provide a sloping surface 18 in which the fiducial line may be engraved at a point intimate to the graduations of circle 11, in order to avoid parallax errors in making observations.

Saddle 45 may be clamped at the desired angle upon frame 29 by manual operation of a pair of identical clamping devices having handles 19, 19. One of these clamping devices, shown in Fig. '1, will now be described. Saddle 45 may be provided with a vertical threaded hole receiving a mating screw 80, having a lower enlarged cylindrical head 8| in which handle 19 is tightly fitted. The opposite or upper end of screw may constitute a tapering portion 82 terminating in a reduced. teat portion 83-rotatively received by a reduced upper portion 84-of the vertical hole in saddle 45. Saddle 45 may also be provided with a horizontal hole 85 whose axis crosses the axis of bore 84 at right angles, and whichslida'bly receives an enlarged head portion 86.01 a bolt generally designated 81 having .a smaller opposite tail portion 88 joined to head portion. 86 by a reduced intermediate neck portion 89. Tail portion 88 is slidably received by arcuate T slot 42 of the frame. The juncture of tailportion 88 and intermediate neck portion 89 provides a shoulder 90 adapted to abut the adjacent shoulder of T slot 42. Head portion 86 of bolt 81 is provided with a transverse tapered hole 92 hav- 6 ing an upper enlarged relief or counterbore 93. Tapered portion 82 of bolt 80 is loosely received by bore or hole '92, being normally eccentrically arranged therein. Rotation of screw 80 in the appropriate direction causes axial advance upwardly thereof, forcing tapered portion 82 into contact with the left side of hole 92 rendering a wedging action resulting in axial movement of bolt 81 toward the left whereby shoulder 90 of the bolt is brought forcibly into abutment with the adjacent shoulder of T slot 42.

Hence by appropriate manipulation of handles 19, 19 saddle 45 may be readily clamped or unclamped to face 4| of frame 29. For example, handles 19, 19 may be manipulated in the appropriate manner to unclamp saddle 45, which may then be adjusted to a new position upon frame 29, being guided during adjustment, however, by arcuate T slot 42 which causes the saddle when being adjusted to describe a perfect arc, the magnitude of which maybe readily determined by reference to graduated circle 11. In Fig. 6 the axis of movement of carriage 49 would be parallel, of course, to the lower fiducial siirface 40 of the frame. However, in Fig. 2, the saddle is shown adjusted to a 45 degree angle withrespect to fiducial surface 40, and therefore move- -ment of the carriage would be at a 45 degree angle with respect to the horizontal, which would cause diamond 32 to move in the proper direction to generate surface 23 upon abrasive wheel 20 responsive to rotation of crank 34.

An apron 94,-Fig. 3, may be secured to the front face of carriage 49 by two screws 95, 95, and precise mutual alignment of the apron and the carriage may be permanently provided for by a tongue 96 integral with carriage 49 tightly received by a mating groove in the apron. Apron 94 may be provided upon its rear face with an integral fragmentary annular, or arcuate, tongue 91 slidably received by a reduced neck portion 98' of a fragmentary annular or arcuate T slot 98 in a fragmentary annular, arcuate, or substantially crescent shaped way member generally designated 99 having precise arcuate way surfaces I00 and IOI. Arcuate T slot 98 and arcuate way surfaces I00 and IOI are circle segments front plate I03 and cover plate I06, which three members therefore constitute a unitary assembly precisely slidable upon arcuate way surfaces I00 05 and IOIand front surface IOI' of crescent shaped way member 99. Hence when arm I02 is moved with respect to way member 99, it will be constrained to describe a perfect circular path about origin 0-0 as a center.

In order to feed carrier I02 with respect to way member 99, a ball crank 33 may be-provided (Fig. 4) rotatably mounted upon a reduced stem portion I08 of a shaft I09. An appropriately' graduated dial IIO having an elongated. knurled hub III may be also rotatably mounted on stem I08, and in addition a knurled thumb nut I I2 may be threaded upon stem I08 at its outer end.

In order to provide means for zero adjustment of dial I I0, the juncture of reduced stem portion I08 with shaft I09 may provide a shoulder I08 adapted to frictionally engage the adjacent face of dial Il when axial 'force is transmitted thru ball crank 33 by tightening thumb nut- II2.

mentioned.

Pinion I I meshes with a fragmentary internal gear segment II1 which may be secured to way member 99 by screws II8. Internal gear segment II1 may be of substantially Z shape in section and may be provided on its outer leg with an integral annular lip or flange II9. Gear segment H1 and way member 99 constitute a unitary assembly which is, when moved with respect to apron 94, constrained to move in an arcuate path of precise circular configuration about origin OO as a center due to sliding engagement 'of arcuate tongue 91 in matingneck portion 98' of arcuate Tslot 98 together with retaining arcuate flange II9 of gear segment II1.

In order to provide means for indicating the angular' relation of way member 99 with respect to apron 94 a-graduated circle I may be engraved upon the front face I2I of internal gear segment II1 which may be compared with fiducial line I22 (Fig. 6) engraved on the front face of apron 94, and also fiducial line I23 engraved on cover plate I06. For permitting optional adjustment of way member 99 with-respect to apron 94, a pair of identical clamping devices may be provided having knurled thumb nuts I23,'I23 threaded upon clamp screws I24, I24, one of which is shown in detail inthe broken away portion of Fig. 10. Nut I23 is threaded upon screw I24 which has at its opposite end an integral head I25 slidably but not rotatably received by arcuate T slot 98 which has been previously described.

Referring now to Fig. 3, carrier arm I02 may be provided at its free end with an adjustable mount for diamond point 32, which will now be described. Free terminal portion 26 of arm I02 may have a downwardly hanging, elongated, hollow, cylindrical, integral boss I21 having an internal thread in which is precisely and rotatably fitted a threaded sleeve I28 having .at its lower end an integral annular flange I29. An

externally graduated and knurled micrometer collar I may be rotatably journaled upon boss I21, and may have at its lower end an inwardly overhanging integral annular flange I3I, the in-.

ner surface I3I' of which is tightly fitted on the adjacent surface of sleeve I28. The outer surface I29 of flange. I29 may be adrive fit in the internal mating surface of collar, I30 so that collar I30 and sleeve I28 constitute a unitary assembly.

Rotatably received by sleeve I28 may be a lower reduced portion I32 of a quill I 33 having a tapered mouth at its upper end adapted to receive the mating head portion I34 of a cylindrical collet or spring chuck I35 adapted to receive and grip shank I36 in the upper terminal of which diamond point 32 is securely set. To prevent rotation of quill I33, but to permit axial displacement thereof, the latter may be provided with a keyway I31 adapted to slidably receive a cylindrical teat portion I38 of a screw I39 received by an appropriately threaded aperture in an overhanging bos's I40 integral with the free terminal of arm I02. A check nut I4I may be provided to prevent undesired rotation of screw I39. Collet I35 may have at its lower end an axially disposed threaded aperture adapted to rotatably receive a mating threaded screw or draw bar I42 which passes rotatably thru reduced lower portion I32 of quill I33 and is provided at its lower end with an enlarged, knurled integral head I43. Whenknurled head I43 is rotated in the proper direction to draw collet I35 downwardly, tapered head I34 of the latter is contracted inwardly by the mating tapered mouth of quill I33. Contraction of the diameter of collet I35 is facilitated by three slits I44, I44, I44 which permit resilient contraction or expansion of the diameter of the upper p'ortion-of the collet responsive to the influence of tapered head I34 acting in conjunction with tapered mouth of quill I33. Hence collet I35 may be caused optionally to grip or release diamond shank I36 upon application of rotational efifort in the appropriate direction to knurled head I43 of draw bar I42. I

When collet I 35 .is drawn down to the gripping position, sleeve I28 is capable of free 'rotation, but is prevented from undesired axial play with respect to quill I 33, due to'its being closely but rotatably confined axially between the upper face of head I43 and shoulder I33 of the quill I 33. Rotation of micrometer collar I30 together with associated threaded I sleeve I28 causes axial displacement of the same together with-collet I35, quill I 33, diamond shank I36 and drawbar I42, which axial displacement is precisely responsive to small rotational adjustments of micrometer collar I30. Micrometer collar I30 is of course graduated to read in appropriate units indicating linear axial travel. Hence micrometer collar I30 together with the associated elements just described constitutes feeding means for imparting movement to diamond point 32, the magnitude of which is appropriately indicated by the graduations on the collar.

Now arcuate T slot 42, arcuate T slot 98, and

crescent shaped way member 99 are aligned to have a common origin or center O-O; that is to say, they are precise circle segments each having a difierent radius, but all being struck from the common center or origin OO. It is desirable to use this origin or center OO as a datum line for the settings of diamond point 32;

and therefore, for thispurpose, a gauge I45 (Figs. 3, 11) is provided, comprising a precisely finished rectangular steel block I46 secured by screws I46, I46 to cross bar I41 of a U shaped yoke having spaced parallel arms, I 48, I48, provided at their free ends with transverse aligned apertures rotatably journaled upon a-pair of axially aligned studs I 49, I49 securely fitted into aligned side bosses I50, I50 of carrier arm I02. Inner surface or face I5I of gauge block I46 may be of precise arcuate configuration having the central common axis of studs I49, I49 as an origin or center, so that when yoke I41 isswung up vertically, as indicated by the dot-dash line I;

in Fig. 3, about studs I49, I49 as an axis, face I5I of the gauge will coincide precisely with origin or center line 0. Hence,in preparing the device for generating an arcuate profile, gauge I45 may be swung up to the vertical position, and diamond point 32 brought into contact with the same, after releasing collet I35; and then micrometer collar I30 may be set at zero, after which collet I35 may be again tightened. Diamond 32 may now be either raised or lowered as desired a definite distance either above or below the datum or origin line OO by appropriate rotation of micrometer collar I30. If diamond point 32 is raised a given distance above the datum line, a concave arcuate path having a radius equal to the distance raised will be described by the diamond 32 when carrier arm I02 is fed along arcuate way member IOI by manual rotation of ball crank 33, or when arcuate way member 99 is adjusted with respect to apron 94, or when saddle 45 is shifted upon the face of pedestal 29. If diamond point 32 is lowered a given distance it will describe a convex arcuate path having a radius equal to the distance lowered, if motion is imparted to the former by any of the adjustments just enumerated. Hence arcsyeither concave or convex, and of the desired radius may be generated by first setting diamond 32 are the origin or datum line O--O using gauge I46, and subsequently raising or lowering the diamond by adjusting micrometer I30 to the radius desired.

In operation, the illustrated device according to the invention is first positioned upon the magnetic chuck 25 of the surface grinder, being properly aligned so that rear fiducial edge 3I of the frame 29 is against the adjacent face of rail 21, and so that diamond point 32 is exactly below the center of abrasive wheel 20. Diamond point 32 is now set at origin or datum line 0-0 in the manner above described, micrometer collar I30 being set at zero. Assuming saddle 45 to be in the normal horizontal position illustrated in Fig. 6, profile a, Fig. 1, may be generated by first producing surface a, which may be accomplished by first loosening clamp handles I9, 'I9/and then swiveling saddle 45 around ina clockwise direction into the southwest quadrant to the angle of face a, after which the saddle is locked in position by tightening clamping handles I9, I9. In

swiveling saddle 45 around to the new angular 1 position'carriage 49 together with all mechanism associated therewith will swivel with the former, including crescent shaped way member 99. It is desirable to return way member 9km the original central or normal position shown in Fig. 6, independent of saddle 45, so as to provide a maximum of visibility of the profile being generated and also to provide a maximum of clearance for wheel 20, between surfaces 29 and 29". In order to bring this about, knurled thumb nuts I23, I23 may be loosened, unclamping way member 99 from apron 94, after which: the former may be returned by hand to the position shown in Figs. 2 and 6, after which it may be clamped in this position by again tightening thumb nuts I23, I23. Since it is desirable t omdispose the axis of diamond shank 136 in a position normal to the face a while dressing the same, ball crank 33 may be rotated in the appropriate direction to bring this about. Face 0. .may now be generated by feeding the diamond back and forth across the same by rotating crank 34, the depth of successive cuts of the abrasive wheel being regulated by lowering the same progressively by using the vertical feed control commonly furnished as a part of the surface grinder. Surface a" may now be generated by adjusting saddle 45 around to the vertical position at 90 degrees, and then neutralizing the corresponding movement of way member 99 by returning the same to the original position as above described, and then feeding diamond 32 up and down vertically by appropriaterotation of crank 34. The convex arc a',

which is tangent to both faces a" and a"", may now be generated. This is carried out by first moving diamond 32 downward by appropriate rotation of micrometer collar I30 following which the diamond 32 may be swept thru the correct arcuate path by appropriate rotation of ball crank 33. In adjusting micrometer collar I30 to produce are a', diamond 32 is of course lowered 'a distance equal to the radius of are a'. The limits of are a' are of course'the points where the same becomes tangent to or meets faces a" and a", and the range of sweep of the diamond necessary to generate are a' may be correctly maintained by reading dial I I0 which indicates in degrees of arc the angular sweep of the diamond. After completing the production of are a, face a" may be produced. Face 11" is of course tangent to arc a', and therefore, in passing to the production of face a"" the pre-. vious adjustment of micrometer collar I30 is not disturbed; However, clamp handles I9, I9 are loosened and saddle 45 swiveled around in counterclockwise direction into the southeast quadrant to the angle corresponding to face a"',', and/ there clamped .by tightening clamp handles I9, I9. As above pointed out, the, swiveling motion just imparted to saddle 45 will be likewise imparted to way member 99, and since it is desirable to return the latter to the normal central position, this may now be done after loosening thumb nuts I23, I 23. After readjusting way member 99 back to normal position, thumb nuts I23, I23 should of course be again tightened. Since saddle 45 is now tilted at the correct angle, face 11"" may be produced by feeding the diamond back and forth across the same by appropriate rotation of crank 34. Since the adjustment of micrometer collar I30 has not been disturbed, face a" will be precisely tangent to are a' previously generated.

An infinite variety of profiles, of which a, b, and c, Fig. 1, are illustrative may be readily generated by the device according to our invention. In

producing the faces I), b' and b" of profile b in Fig. 1 the diamond 32 is of course caused to move through-the correct angular paths by first setting saddle 45 at corresponding angles on pedestal 29, and then feeding the diamond back and forth by appropriate rotation of crank 34. The arc b" is concave, as distinguished from the are a' of profile a which is convex, and to producethis concave arc diamond 32 is of course raised above datum or origin line OO by adjustment of micrometer collar I30 a distance equal to the radius of arc b' after which the same may be generated by appropriate rotationof crank 33.

The principles of operation applicable to the production of profiles a and I) just described above are of course equally applicable to the production of profile 0, but if desired, faces 0 and 0" may be generated by using the transverse table feed control of the surface grinder, which will pass diamond 32 back'and forth transversely of the abrasive wheel'20, in a manner similar to that which would beattained by adjusting saddle 45 to the horizontal position and feeding diamond 32 back and forthby rotation of crank 34. In preparing the device for the production of are c", the diamond would of course be raised above the datum line OO by adjusting micrometer collar I30 until the same indicates that the diamond has beenraised a distance equal to the radius of are c. Arc 0" may be generated by passing diamond 32 thru-the arcuate path corresponding to the adjustment of micrometer collar I30 as abovedescribed. In the production of arc c" considerable abrasive material. of the wheel 20 must be removed, and this may be readily accomplished by beginning the removal of material at the original wheel face coincident with faces 0' and c', and subsequently making successive transits of the diamond 32 around the are c' by rotation of crank 34, the wheel 20 being successively lowered for each new cut by appropriate adjustments of the vertical feed device forming a part of the ordinary surface grinder.

It is intended that in generatin rofiles with the device as above described that the conventional feedin devices formin a part of the surface grinder be utilized so as to remove the correct amount of material from the face of the abrasive wheel at each pass of the diamond. Accordingly, the vertical and horizontal feeds of the surface grinder are referably used in conjunction with the several control handles of our device in the manner ordinarily em loyed in the art.

Having thus fully described the invention bv disclosing an illustrative embodiment thereof. it is apparent that the same contem lates a device which may be utilized as a portable attachment for surface grinders to' generate upon the abrasive wheels thereof an infinite variety of complex profiles consisting of various combinations of radial and rectilinear components the inter-dimensional relationship of which are very precise. The device embodying the invention here n set forth is capable of ready manipulation and it is therefore particularly applicable for the expeditious production of profiles upon abrasive wheels.

While we have shown and described in detail a preferred embodiment of our invention. we do not desire to be limited to the precise details hereinset forth illustratively, as many modifications may be made within the scope of the invention,

which is defined in the following claims.

We claim:

-1. In a device of the class described. a mounting element having spaced arcuate arms. a saddle adjustable upon said mounting element in an are along said arcuate arms. clamping devices for securing said saddle to said mountizgelement,

a carriage slidable on said saddle, ma al y operable feed mechanism for sliding said carriage. a substantially crescent shaped way membenadjustable upon said carriage, a carrier slidable along said way member, manually operable feed mechanism for sliding said carrier, a micrometer head mounted upon said carrier and including a clamping device, a diamond held by said clamping device, and a gauge associated with said carrier for setting said diamond.

2. In a device of the class described, mounting means, an element upon said mounting means adjustable in an arcuate path in a vertical plane thereupon, clamping devices optionally operable for permitting adjustment of said element with respect to said mounting means, a carriage upon said element adjustable in arectilinear path in a vertical plane thereupon, means for feeding said carriage with respect to said element, an arcuate way, member adjustable in an arcuate path in a vertical plane associated with said carriage, op-

tionally operable clamping devices for permitting adjustment of said way member with respect to said carriage, a carrier slidable with respect to said way member and mounted thereupon, means for feeding said carrier along said arcuate way member, an instrumentality for dressing abra sive wheels adjustably associated with said carrier,

and gauge means associated with said carrier and optionally operable for setting said instrumen-' tality.

3. Ina device of the class described, a mount having a horizontal foot portion and an integral vertical portion, said vertical portion having an arcuate slot, a saddle adjustable upon said vertical portion and having a tongue engaging said arcuate slot, endplates for said saddle, a stationary screw mounted between said endplates; a carriage having an aperture mounted upon said saddle and slidable therealong, said screw passing thru said aperture, feeding mechanism associated with said carriage and engaging said screw, overlapping 'dust covers associated with said carriage, a

mounting member secured to said carriageand having an arcuate tongue, an arcuate way member adjustable upon said mounting member and having an arcuate groove, said arcuate tongue engaging said arcuate groove in said way member, a carrier slidable upon said arcuate way member,

feeding mechanism associated with said carrier for feeding said carrier along said way member,

an adjustable micrometer head also associated with said carrierand including clamping mechanism, a diamond clamped by said clamping mechanism, and a gauge swingably associated with said carrier and susceptible of optional operation for arm for setting said diamond.

5. In combination, a frame member having a base portion and a vertically disposed mount portion comprising spaced arcuate arms, a saddle mounted on said mount portion and susceptible of adjustment in an are along said arcuate arms, locking devices for said saddle, a carriage slidable along said saddle, .a crescent shaped way member adjustable on said carriage, a carrier slidable along said way member, a diamond adjustably mounted on said carrier, and a gauge as.- sociated with said carrier for setting said diamond. 6. In combination, a frame member comprising a foot portion and an integral vertically disposed mount portion having spaced arcuate arms, a saddle mounted on said mount portion and susceptible of adjustment in an arcuate path along said arcuate arms, locking devices for anchoring said saddle to said mount portion at a predetermined point of said arcuate path, a carriage slidable along said saddle, manually operable feed mechanism for sliding said carriage along said saddle, a crescent shaped way member adjustable on said carriage, a carrier slidable along said way member, a' diamond. adjustably mounted on said carrier, and a gauge associated with said carrier for setting said diamond.

7. In combination, a ,frame member comprising a foot portion and an integral vertically disposed mount portion having spaced arcuate arms, a saddle mounted on said mount portion and susceptible of adjustment in an arcuate path along said arcuate arms, locking devices for anchoring said saddle to said mount portion at a predetermined point in said arcuate path, a carriagejslidable along said saddle, manually operable feed mechanism for sliding said carriage along said saddle, an apron secured to said saddle, a crescent shaped way member mounted on said apron and susceptible of adjustment in an arcuate path, locking. devices for anchoring said way member to said apron at, a predetermined point in said arcuate path, a carrier slidable along said way member, a diamond mounted on said carrier, and a gauge associated with said carrier ior setting said diamond.

8. In combination, a frame member comprising a foot portion and an integral vertically disposed mount portion having spaced arcuate arms; a saddle mounted on said mount portion and susceptible of adjustment in an arcuate path along said arcuate arms, locking devices for anchoring said saddle to said mount portion at a predetermined point in said arcuate path, a carriage slidable along said saddle, manually operable feed mechanism for sliding said carriage along said saddle, an apron secured to said saddle, a crescent shaped way-member mounted on said apron and susceptible of adjustment in an arcuate path, locking devices for anchoring said way member to said apron at a predetermined point in said arcuate path, a carrier slidable along said way member, manually operable teed-e ing mechanism for sliding said carrier along said way member, a diamond associated with said carrier, and a gauge also associated with said carrier for setting said diamond.

9. In combination, a frame member comprising a foot portion and an integral verticallydisposed mount portion having spaced arcuate arms, a saddle mounted on said mount portion and susceptible of adjustment in an arcuate path along said arcuate arms, locking devices for anchoring said saddle to said mount portion at a predetermined point in said arcuate path, a

carriage slidable along said saddle, manually operable feed mechanism for sliding said carriage along said saddle, an apron mountedpn saidsaddle, a crescent shaped way member mounted on said apronand susceptible of adjustment in an arcuate path, locking devices for anchoring said way member to said apron at a predetermined point in said arcuate path, a carrier having an overhanging terminal portion slidable along said way member, manually operable feeding mechanism for sliding said carrier along said way-member, a micrometer head associated with said carrier and disposed on said overhanging terminal portion, a diamond associated with said micrometer head, a gauge comprising a yoke having a bridge portion and integral spaced arms, said arms being disposed in straddling relation ,to said terminal portion, and pivot means for permitting swinging motion of said gauge with respect to said terminal. portion whereby said 1 bridge portion may be brought into abutting relation with said diamond.

'10. In a device of the character described, a frame member provided with a mount portionfineluding arcuate supporting elements, a saddle adjustable upon saidmount portion, a carriage movably mounted on said saddle, a crescentshaped way member adjustable on said carriage,

;a carrier having an arm overlying and slidable along the way member, said arm being disposed between the arcuate supporting elements and including a micrometer head, a diamond mounted in said micrometer head, and a gauge associated with said overlying arm for setting the diamond.

EDWARD, A. JOHNSON. ALEXANDER A. mlL-IANOFF. 

